# US 11,028,851 B2 · Liquid pump including an impeller connected directly to a rotor receiving sleeve > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,028,851 B2 - Document ID: US11028851B2 - Status: Granted - Kind: B2 - Application number: 15/914,829 - Filed: 2018-03-07 - Published: 2018-09-13 - Granted: 2021-06-08 - Earliest claimed: 2017-03-08 - Assignees: Mahle International GmbH - Applicants: Mahle International GmbH - Inventors: Johannes Diekmann; Michael Krappel; Andrej Rul - Web page: https://patentgrep.com/patent/US11028851B2 ## CPC - F04D 13/06: the pump being electrically driven - F04D 13/064: {Details of the magnetic circuit} - F04D 25/06: the pump being electrically driven (F04D25/08 takes precedence) - F04D 25/0606: {the electric motor being specially adapted for integration in the pump} - F04D 29/0473: {for radial pumps} - F04D 29/20: Mounting rotors on shafts - F04D 29/2261: {with special measures} - H02K 1/30: using intermediate parts, e.g. spiders - H02K 5/128: using air-gap sleeves or air-gap discs - H02K 5/1285: {of the submersible type} - H02K 7/14: Structural association with mechanical loads, e.g. with hand-held machine tools or fans (with fan or impeller for cooling the machine H02K9/06) - F04D 29/086: {especially adapted for liquid pumps} - F05B 2240/14: Casings, housings, nacelles, gondels or the like, protecting or supporting assemblies there within - F05B 2240/20: Rotors - F05B 2280/4003: Synthetic polymers, e.g. plastics - F04D: NON-POSITIVE-DISPLACEMENT PUMPS (engine fuel-injection pumps F02M; ion pumps H01J41/12; electrodynamic pumps H02K44/02) - H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53}) - F05B: INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G ## Abstract A fluid pump for conveying a fluid may include an internal rotor rotatable about an axis of rotation relative to an external stator and an impeller connected to the internal rotor in a rotationally fixed manner configured to convey a fluid. The internal rotor may include a rotor receiving sleeve having a base body. The base body may include a receiving chamber configured to receive an anchor unit. The internal rotor may further include a bearing bushing penetrating the rotor receiving sleeve coaxially to the axis of rotation. The bearing bushing may be configured to receive a rotor shaft. The impeller may be directly connected to the rotor receiving sleeve in a rotationally fixed manner. ## Claims ### Claim 1 A fluid pump, comprising: an internal rotor rotatable about an axis of rotation relative to an external stator; an impeller connected to the internal rotor in a rotationally fixed manner for conveying a fluid; the internal rotor including a rotor receiving sleeve, the rotor receiving sleeve including a base body having a receiving chamber configured to receive an anchor unit; the internal rotor further including a bearing bushing structured and arranged to penetrate the rotor receiving sleeve coaxially to the axis of rotation, the bearing bushing configured to receive a rotor shaft; wherein the impeller is directly connected to the rotor receiving sleeve in a rotationally fixed manner; wherein the base body defines the receiving chamber such that receiving chamber opens toward the impeller; and wherein the rotor receiving sleeve, on a side facing away from the impeller, includes at least two positioning noses, the at least two positioning noses arranged equidistant from one another in a circumferential direction of the axis of rotation and disposed radially outside of the bearing bushing. ### Claim 2 (depends on 1) The fluid pump according to claim 1, wherein the receiving chamber is closable by a cover, and the cover is a separate component from the impeller. ### Claim 3 (depends on 2) The fluid pump according to claim 2, wherein the impeller is directly connected to the base body in a rotationally fixed manner. ### Claim 4 (depends on 1) The fluid pump according to claim 1, wherein the receiving chamber is closable by a cover and the impeller is directly connected to the cover in a rotationally fixed manner. ### Claim 5 (depends on 4) The fluid pump according to claim 4, wherein the impeller and the cover are integrally provided as a single piece. ### Claim 6 (depends on 1) The fluid pump according to claim 1, wherein: the base body includes a bottom, a cylindrical inner wall, and a cylindrical outer wall; the cylindrical inner wall and the cylindrical outer wall project from the bottom toward the impeller such that the bottom at least partially defines an axial end of the base body opposite the impeller; and the receiving chamber is defined by the cylindrical inner wall, the cylindrical outer wall, and the bottom such that the receiving chamber is annular. ### Claim 7 (depends on 6) The fluid pump according to claim 6, wherein the cylindrical inner wall, the cylindrical outer wall, and the bottom are integrally provided as a single piece such that the base body is a monolithic structure. ### Claim 8 (depends on 6) The fluid pump according to claim 6, wherein: the impeller is coupled to the cylindrical inner wall of the base body via an internal welded connection and to the cylindrical outer wall of the base body via an external welded connection; and the internal welded connection and the external welded connection fluidically seal the receiving chamber. ### Claim 9 (depends on 6) The fluid pump according to claim 6, further comprising a cover arranged on the rotor receiving sleeve closing the receiving chamber, wherein: the cylindrical inner wall and the cylindrical outer wall each include an axial protrusion projecting therefrom toward the impeller; and the axial protrusion of the cylindrical inner wall engages a complimentary inner receptacle of the cover and the axial protrusion of the cylindrical outer wall engages a complimentary outer receptacle of the cover. ### Claim 10 (depends on 9) The fluid pump according to claim 9, wherein at least a portion of the cover extends into the receiving chamber between the axial protrusion of the cylindrical inner wall and the axial protrusion of the cylindrical outer wall. ### Claim 11 (depends on 1) The fluid pump according to claim 1, wherein the impeller is directly connected in a rotationally fixed manner to an impeller holder disposed on the base body. ### Claim 12 (depends on 11) The fluid pump according to claim 11, wherein the impeller holder is integrally molded on the base body. ### Claim 13 (depends on 11) The fluid pump according to claim 11, wherein: the impeller holder includes an annular collar on a side facing the impeller; and the annular collar engages a complimentarily structured recess of the impeller. ### Claim 14 (depends on 11) The fluid pump according to claim 11, wherein the impeller includes an annular web on a side of the impeller facing the impeller holder, the annular web enclosed by two radially spaced apart annular grooves and configured to support an annular collar of the impeller holder. ### Claim 15 (depends on 14) The fluid pump according to claim 14, wherein the impeller has a support surface on a side facing away from the annular web, the support surface having a diameter that is equal to or larger than a diameter of the annular web. ### Claim 16 (depends on 1) The fluid pump according to claim 1, further comprising two bearing sleeves arranged axially spaced apart from one another and configured to receive the rotor shaft, the two bearing sleeves arranged such that an annular chamber is defined radially between the bearing bushing and the rotor shaft when the rotor shaft is received within the bearing bushing and the two bearing sleeves. ### Claim 17 (depends on 16) The fluid pump according to claim 16, wherein the two bearing sleeves are arranged on opposing longitudinal ends of the bearing bushing. ### Claim 18 (depends on 16) The fluid pump according to claim 16, wherein a first bearing sleeve of the two bearing sleeves is arranged on a longitudinal end of the bearing bushing facing away from the impeller and a second bearing sleeve of the two bearing sleeves is arranged in the impeller at an axial distance from the bearing bushing. ### Claim 19 (depends on 18) The fluid pump according to claim 18, wherein: the rotor receiving sleeve includes a first radially projection and a second radial projection that extend toward the axis of rotation; at least a portion of the first bearing sleeve is disposed axially between and in abutment with the first radial projection and the bearing bushing; and at least a portion of the second bearing sleeve is disposed axially between and in abutment with the second radial projection and the bearing bushing. ### Claim 20 (depends on 1) The fluid pump according to claim 1, wherein the rotor receiving sleeve at least one of: at least partially radially encloses the bearing bushing at least on an outer jacket surface thereof; and at least partially axially engages around the bearing bushing. ### Claim 21 (depends on 1) The fluid pump according to claim 1, wherein: the rotor receiving sleeve is a plastic injection molded part; the rotor receiving sleeve is secured via direct injection onto the bearing bushing; and the rotor receiving sleeve and the bearing bushing are operatively connected via at least one of a positive connection and a frictional connection. ### Claim 22 (depends on 1) The fluid pump according to claim 1, wherein the at least two positioning noses includes two positioning noses arranged offset by 180° in the circumferential direction of the axis of rotation. ### Claim 23 (depends on 1) The fluid pump according to claim 1, wherein the impeller includes a passage opening concentric to the bearing bushing. ### Claim 24 (depends on 1) The fluid pump according to claim 1, wherein at least one of: the rotor receiving sleeve is connected to the impeller via at least one of ultrasonic welding, rotational friction welding, and laser beam welding; the impeller is adhered to the rotor receiving sleeve; and the impeller is connected to the rotor receiving sleeve via a positive connection. ### Claim 25 A fluid pump, comprising: an internal rotor rotatable about an axis of rotation relative to an external stator; an impeller connected to the internal rotor in a rotationally fixed manner for conveying a fluid; the internal rotor including a rotor receiving sleeve, the rotor receiving sleeve including a base body having a receiving chamber configured to receive an anchor unit; the internal rotor further including a bearing bushing structured and arranged to penetrate the rotor receiving sleeve coaxially to the axis of rotation, the bearing bushing configured to receive a rotor shaft; wherein the impeller is directly connected to the rotor receiving sleeve in a rotationally fixed manner; wherein the base body includes a bottom, a cylindrical inner wall, and a cylindrical outer wall; wherein the cylindrical inner wall and the cylindrical outer wall project from the bottom toward the impeller such that the bottom at least partially defines an axial end of the base body opposite the impeller; wherein the receiving chamber is defined by the cylindrical inner wall, the cylindrical outer wall, and the bottom such that the receiving chamber is annular; wherein a cover is arranged on the rotor receiving sleeve closing the receiving chamber; wherein the cylindrical inner wall and the cylindrical outer wall each include an axial protrusion projecting therefrom toward the impeller; and wherein the axial protrusion of the cylindrical inner wall engages a complimentary inner receptacle of the cover and the axial protrusion of the cylindrical outer wall engages a complimentary outer receptacle of the cover. ### Claim 26 A fluid pump, comprising: an internal rotor rotatable about an axis of rotation relative to an external stator; an impeller connected to the internal rotor in a rotationally fixed manner for conveying a fluid; the internal rotor including a rotor receiving sleeve, the rotor receiving sleeve including a base body having a receiving chamber configured to receive an anchor unit; the internal rotor further including a bearing bushing structured and arranged to penetrate the rotor receiving sleeve coaxially to the axis of rotation, the bearing bushing configured to receive a rotor shaft; wherein the impeller is directly connected to the rotor receiving sleeve in a rotationally fixed manner; wherein the impeller is directly connected in a rotationally fixed manner to an impeller holder disposed on the base body; and wherein the impeller includes an annular web disposed on a side of the impeller facing the impeller holder, the annular web enclosed by two radially spaced apart annular grooves and configured to support an annular collar of the impeller holder.